. >> there's assumption the united states has military might wipe out tuclear prrams. but there's -- there's an argunt tt ramaking, these things are hidden, underground. how do we know wheer we would just be slowing them down and delaying the inevitable? >> well, i think we have to -- here again we have to wreck flies a certain fact. neither the ud es n is ces t iranian capacity to build a nuclear weapon once and for all. we can destroy all of the facilities in the infrastructure that they have and it would be very costly and takehem time to rebuild it, but they have the know-how and engineering calio ilater would be destroyed. one of the reason it's important to create a context where the international community believes everything's been done that could be done and you've exhausted all of t diplomatic options andiven the economic sanctions sufficient time, you need that so that the world says, yo knowat? ianad chanc to prevent the use of fce against them, they didn't take it because they really want a nuclear weapon. we need to create the kind of context that demonst